diff --git a/src/Application/Actions/ActionError.php b/src/Application/Actions/ActionError.php
index 798a688f..3a81cc53 100644
--- a/src/Application/Actions/ActionError.php
+++ b/src/Application/Actions/ActionError.php
@@ -20,9 +20,9 @@ class ActionError implements JsonSerializable
 
     private string $type;
 
-    private string $description;
+    private ?string $description;
 
-    public function __construct(string $type, ?string $description)
+    public function __construct(string $type, ?string $description = null)
     {
         $this->type = $type;
         $this->description = $description;
@@ -39,7 +39,7 @@ public function setType(string $type): self
         return $this;
     }
 
-    public function getDescription(): string
+    public function getDescription(): ?string
     {
         return $this->description;
     }